416 R - Knuth. — Oxalidaceae. 



Sect. 5. Grandifoliolata R. Knuth. 



A. Flores parvi, bracteis quasi absconditi. — Brasilia . . . . 49. B. somnians. 



B. Flores circ. 1 cm longi. 



a. Folia 3 — 6-juga. Pedunculi 4 cm longi. Sepala oblonga. 



— Peruvia 50. B. Foxii. 



b. Folia 8 — 10-juga. Pedunculi 10 — 12 cm longi. Sepala 



± anguste lanceolata. — Peruvia Orient 51. B. amazonicum. 



49. B. somnians (Mart. et Zucc.) R. Knuth in Notizbl. Bot. Gart. Berlin VII. (4 919) 

 317. — Oxalis somnians Mart. et Zucc. ex Zucc. in Denkschr. Akad. Muench. IX. (1825) 

 181, n. 78, t. 4; Zucc. in Abh. Akad. Muench. I. (1829—30) 271, n. 101; Mart. Fl. 

 Brasil. XII. 2. (1872 — 77) 516. — Toddavaddia somnians 0. Ktze., Rev. gen. I. (1891) 

 96. — Radix perennis, lignosa, oblique descendens, fibras flexuosas filiformes emittens, 

 fusca. Caulis lignosus, basi prostrata radicans, sursum ascendens, 30—50 cm altus, 

 simplex, teres, ad nodos subincrassatus, cortice cinereo-fusco obtectus, pilis brevibus 

 adpressis fuscis subtomentosus. Folia ad nodos et apicem caulis subverticillata, petiolata, 

 4 — 6-juga; foliola inaequilateralia, sursum majora, usque 4 cm longa et 2V2 cm l^ a j 

 ima minima oblique subcordata acuta; superiora e basi truncata obovata, apice rotun- 

 data, basi dente seu angulo retrorsum spectante instructa; omnia subciliata, utrinque 

 pilis brevibus adpressis pubescentia, venis subtus prominentibus percursa; petioli basi 

 incrassata rugoso-sulcati, subamplexicaules ; rhachis villo denso brevi praesertim subtus 

 obtecta. Pedunculus axillaris, solitarius, 7 — 12 cm longus, rectus, teres, pilis brevibus 

 fuscis pubescens, basi bracteis plurimis lineari-lanceolatis acuminatis pubescentibus fuscis 

 aridis cinctus, multiflorus. Flores parvi, in capitulum densum congesti, brevissime pedi- 

 cellati, bracteis permultis e basi lanceolata subulato-setaceis ciliato-hispidis quasi absconditi. 

 Sepala lineari-lanceolata , glabra, apice subciliata, subulato-acuminata. Petala sepalis 

 parum longiora, oblonga, obtusa, rosea, basi alba. Filamenta basi complanata, sursum 

 subulata; maiora pistillo magis quam duplo breviora; minora eisdem 2-plo breviora, vix 

 ovarium superantia; antherae ovatae, flavae. Ovarium ovato-globosum, pentagonum, 

 sursum pubescens. — Fig. 2 5 D — F. 



Brasilien: Prov. Rio Negro am Flusse Yapura in der Nähe der Cupata- Wasser- 

 fälle (v. Marti us nach Zuccarini — Typus). — Blühend Februar. 



50. B. Foxii Sprague in Kew Bull. (1911) 343. — Herbacea, erecta. Caulis 5!/ 2 cm 

 longus, adpresse pilosus. Folia 8, apice caulis quasi verticillata, 3*/ 2 — 8 cm longa. 

 3 — 6-juga; foliola terminalia oblique obovata, 2 — 3 cm longa, 1 ^3 — 2 cm lata, cetera 

 deorsum sensim minora, basi truncata, intermedia subtrapezoidea, infima triangulari- 

 ovata. Pedunculi 4 cm longi, crispule pubescentes, multiflori. Sepala oblonga, acuminata, 

 setula y 2 — 1 mm longa terminata, 6y 3 mm longa, 1 3 / 4 mm lata, pilis acutis minute 

 ciliata, extus papillato-pilosa, 7 — 9-nervata. Gorolla alba, ima basi excepta gamopetala; 

 tubus 6 mm longus, basi foraminibus 5 triangularibus vix y 2 mm longis aperlus; lobi 

 reflexi, oblongo-obovati, explanati 4 1 / 2 mm longi, 3^ mm lati. Filamenta staminum 

 minorum 3 — 3 1 /s mm longa, sursum angustata, glabra; filamenta staminum maiorum 

 4V4 mm longa, extus pilis acutis et papilliformibus minute pilosa, basi leviter angustata, 

 vix glandulosa. Pistillum 1 3 / 4 mm longum, superne per 1 mm minute pilosum. 



Peru (W. Fox nach Sprague — Typus). 



Nota. Species sec. autorem aifinis est B. somnianti, a quo bracteis quam Acribus brevi- 

 oribus, sepalis pro rata latioribus minus attenuatis diflert. 



51. B. amazonicum R. Knuth, spec. nov. — Subacaule, saepe 18 cm altum. Radix 

 profunde in solum penetrans, usque 5 mm crassa, =b verticalis. Caulis subnullus. Folia 

 usque 15 cm longa et 4 cm lata, circ. 9— 12-juga; petiolus 1 cm longus; rhachis sub- 

 hirsuta; foliola late rectangularia vel late oblongo-rectangularia, media saepe 2 cm longa 

 et 10 — 12 mm lata, basi retusa, apice retuso-rotundata. minute obtuse mucronulata, 

 mucrone */ 2 mm longo, glauca, margine sparse ciliata, faciebus glabra; infima cordata; 

 summa oblique late obovata. Pedunculi usque 17 cm longi, 1 — 4 in specimine, sub- 



